Hey guys on my 97 Polaris 680 Triple the middle exhaust pipe is not getting hot. Compression on all 3 pipes are the same being just over 100. I put a brand new spark plug in and checked and saw there a spark. I took out the carb and the bowl seemed to be full of gas. I was able to get the it running perfect earlier tonight after I reinstalled the carb. and then after I shut it off and restarted it the middle pipe would not get hot again. Maybe an electrical problem since it ran awesome for a little bit? Any suggestions?